Juneau is unique among the 49 U.S. capitals on mainland North America in that there are no roads connecting the city to the rest of the state or North America.
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The absence of a road network is due to the extremely rugged terrain surrounding the city. This in turn makes Juneau a de facto island city in terms of transportation, since all goods coming in and out must go by plane or boat, in spite of the city's location on the Alaskan mainland.
With no road access to Juneau, it is the only state capital in the country that is accessible only by airplane or boat. One of the reasons Juneau has so much character is that it is one of Alaska's oldest cities.
Alaska is most certainly American, but it's more than 2,000 miles away from the nearest state, Washington. Getting there with a vehicle requires either driving through Canada or taking a ferry.